Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 86-94.doi: 10.3969/j.issn.1673-8926.2016.03.012

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Sedimentary characteristics of Lower Cretaceous sublacustrine fan in BN block of BG Basin, Central Africa

Ouyang Xueqi1， Wang Liang2， L iu Feng2， Zheng Rongcai1， Ren Wei1   

  1. 1. Institute of Sendimentary Geology ，Chengdu University of Technology ，Chengdu 610059 ，China ；2. Research Institute of Exploration and Development ，PetroChina Yumen Oilfield Company ，Jiuquan 735019 ，Gansu ，China
  • Online:2016-05-20 Published:2016-05-20

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Abstract: Sublacustrine fan sand bodies are favorable oil and gas reservoirs, so the study on its sedimentary characteristics has important guiding significance for hydrocarbon exploration. Taking the Lower Cretaceous P Formation in BN block of BG Basin as an example, based on the theories of sedimentary petrology and sequence stratigraphy, this paper analyzed the sedimentary structure of cores, well logging curve combination forms and seismic response characteristics, and studied the regional geological features. The results show that sublacustrine fan is developed in the study area, showing positive cycle sedimentary sequence from bottom to top, and it can be divided into inner-fan,middle-fan and outer-fan sub-facies, which can be subdivided into micro-facies such as branch channel, channel edge natural levee and front sheet sand without channel. The sublacustrine fan sand bodies of P Formation are controlled by gravity flow, and they distributed along the NE-SW with fan shape. The sand bodies at the top and bottom of the branch channel of middle-fan are often sealed by dark-gray mudstones, with good oil and gas accumulation conditions. The sources of the sublacustrine fan mainly came from the northeastern fault basin, first formed large-scale fan delta depositional system in the margin of basin, then were transported to the prodelta or the farther deep lakein the form of turbidity current, and formed sublacustrine fan depositional system eventually. Favorable reservoirs of P Formation are mainly distributed in channel sand bodies of inner-fan and branch channel sandstones of middle-fan on one side of the hanging wall of fault in the northern basin.

Key words: rock, formation, porosity, seism, compressibility, wave velocity, media

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